boolean flag = false;
        Scanner fileInput = new Scanner(new File("Account"));
        BufferedReader br = new BufferedReader(new FileReader("Account"));
        if (br.readLine()==null){
            JOptionPane.showMessageDialog(frame, "Record is empty! Please register an account!");
            new Registration();
            frame.setVisible(false);
        }
        else{
            while(fileInput.hasNextLine()){
                String user = fileInput.nextLine();
                String pass = fileInput.nextLine();
                if (a.equals(user) && b.equals(pass)){
                    flag = true;
                    break;
                }
            }
                if (flag){
                    JOptionPane.showMessageDialog(frame, "Login Successful!");
                    new BookingT();
                    frame.setVisible(false);
                }else{
                    JOptionPane.showMessageDialog(frame, "Invalid username or password");
                    username.setText("");
                    password.setText("");
            }